1. Proteins produced on ribosomes
2. Proteins produced on surface of RER folded and processed in RER
3. Proteins transported from RER to Golgi apparatus in vesicles
4. Proteins modified in Golgi apparatus
5. Golgi apparatus packages proteins into vesicles to be transported around the cells where they're required
6. Some proteins such as extracellular enzymes leave the cell by exocytosis